EP3222009A1

EP3222009A1 - Subscriber station for a bus system, and method for adjusting the timing of a transmit signal for a bus system

Info

Publication number: EP3222009A1
Application number: EP15790872.4A
Authority: EP
Inventors: Steffen Walker; Ingo Hehemann
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2014-11-21
Filing date: 2015-10-28
Publication date: 2017-09-27
Anticipated expiration: 2035-10-28
Also published as: CN107113216B; KR20170086608A; EP3222009B1; DE102014223838A1; KR102415141B1; WO2016078884A1; CN107113216A

Abstract

Disclosed are a subscriber station for a bus station, preferably a local interconnect network (LIN) bus system, and a method for adjusting the timing of a transmit signal for a bus system. The subscriber station comprises a detection unit (128) for detecting a bit width of received bits of a message sent via a bus in the bus system, and an adjustment unit (129) for determining the bit width of at least one bit of a message to be sent in order to meet the bus system requirements in respect of the pulse duty factor and adjust the bit width by delaying the edges of a transmit signal corresponding to the message on the basis of the bit width detected by the detection unit (128).

Description

Description title

Subscriber station for a bus system and a method for controlling a timing of a transmission signal for a bus system

Technical area

The present invention relates to a subscriber station for a bus system and a method for controlling a timing of a transmission signal for a bus system to meet the duty cycle requirements.

State of the art

Disclosure of the invention

A Local Interconnect Network (LIN), which is also known as a LIN bus, is used for example in a vehicle for cost-effective communication between intelligent sensors and actuators, in particular in a vehicle door or a vehicle seat. The LIN bus is based on a single-wire bus and is specified as a serial communication system. The LIN bus is the

Field buses and is often combined with a CAN bus. LIN slaves can also be reached from the CAN bus or CAN bus system via a LIN master. With the CAN bus system, messages are transmitted using the CAN protocol, as described in the CAN specification in IS011898.

The requirements for a LIN transceiver, also called LIN transceiver, are:

- compliance with functional parameters, such as sufficient edge timing and periodicity, - emission,

Direct Power Injection (DPI), which is a method of measuring immunity to electromagnetic compatibility (EMC) in accordance with standard I EC 62132-4, and

- Electrostatic discharge (ESD = Electrostatic Discharge).

The certification of LIN transceivers often violates the timing requirements for the transmit signal because the design parameters are tailored too closely to the above requirements in terms of EMC and ESD. Currently, it is necessary to progressively complain about the fulfillment of all of the complex and expensive redesigns of the LIN transceiver

Requirements to touch. In some cases, not all requirements imposed on the LIN transceiver are fulfilled in the series status, which leads to dissatisfaction on the part of the user of the LIN transceiver or of the LIN subscriber station and thus of the LI N bus system.

It is therefore an object of the present invention to provide a subscriber station for a bus system and a method for controlling a timing of a transmission signal for a bus system, which solve the aforementioned problems. In particular, a subscriber station for a bus system and a method for controlling a timing of a transmission signal for a bus system are to be provided, in which elaborate redesign steps for meeting both the requirements in terms of EMC and ESD and the requirements with respect to the timing of edges of the bus system omitted, so that the above requirements can be met in a simple and cost-effective manner.

The object is achieved by a subscriber station for a bus system with the features of claim 1. The subscriber station includes a

A detection unit for detecting a bit width of received bits of a message sent via a bus of the bus system, and a control unit for detecting the bit width of at least one bit of a message to be transmitted to meet the bus system requirements on the duty cycle and by the bit width by delaying the Flanks corresponding to the message Regulate transmit signal based on the detected by the detection unit bit width.

The subscriber station eliminates the need for elaborate redesigning steps to meet both EMC and ESD requirements and the timing requirements of bus system edges. As a result, development costs can be saved on the way to meet the requirements, so that the above requirements can be met in a simple and cost-effective manner.

With the subscriber station, it is possible to realize an ideal duty cycle in transmission mode.

A further advantage is that the subscriber station adapts with the method performed by it to the respective application conditions which result in different bus parameters. This is a big advantage especially for original equipment manufacturers (OEM = Original Equipment Manufacturer), for example in the field of vehicle construction. In addition, the subscriber station eliminates with the one carried out by it

Method the dependence on the tolerances of the semiconductor process.

It is also advantageous that the subscriber station with the method performed by it eliminates the dependence on the environmental conditions, such as variation of the supply voltage and the temperature. As a result, tighter tolerances can be maintained with regard to the electrical properties.

Advantageous further embodiments of the subscriber station are described in the dependent claims.

Preferably, the subscriber station further comprises a transmitting / receiving device for transmitting and / or receiving messages, wherein the detection unit is configured to detect the bit width, while the transmitting / receiving device transmits messages. Possibly, the detection unit is configured to detect the bit width of recessive and / or dominant bits of messages sent over the bus. Since the bit width of recessive and dominant bits on the bus of the bus system is generally different, the limit values for both bit widths can be maintained by a corresponding control of the control unit when detecting both bit widths.

Advantageously, the detection unit is designed to detect the bit width during a synchronization field of the message, wherein the control unit is configured to control the bit width for an upcoming message to be sent. Here can by the constant state change of directly

consecutive bits, the bit width for recessive and dominant bits are detected quickly and reliably.

The bus system may be a LIN bus system, and the control unit may maintain the value for the delay of the edges of the message to be sent until the next in a received message

Synchronization field is pending. Thus, the transmission signal for the message to be sent can always be adapted to the currently prevailing conditions.

The subscriber station may be configured to send and / or receive messages according to the LIN standard.

It is also conceivable that the subscriber station also has a

Communication control device for creating or reading a message for or from another subscriber station of the bus system.

Here, the detection unit and / or the control unit part of

Communication control device or part of the transmitting / receiving device, and the control unit, a transmission signal delay unit is connected downstream, which is part of the communication control device or part of the transmitting / receiving device. The subscriber station described above may be part of a LIN bus system having a bus, and at least two subscriber stations which are interconnected via the bus so that they can communicate with each other. In this case, a first subscriber station can act as a master and at least one second subscriber station as a slave. In addition, the first one is

Subscriber station and the at least one second subscriber station a subscriber station described above.

The above object is further achieved by a method for controlling a timing of a transmission signal for a bus system having the features of

Claim 10 solved. The method comprises the steps of detecting, with a detection unit, a bit width of received bits of a message sent over a bus of the bus system, determining, with a control unit, the bit width of at least one bit of a message to be transmitted, the bus system requests to the Duty cycle, and regulating, with the control unit, the bit width of a signal corresponding to the message to be transmitted by delaying the edges of the transmission signal corresponding to the message based on the detected by the detection unit bit width.

Further possible implementations of the invention also include not explicitly mentioned combinations of before or below with respect to the

Embodiments described features or embodiments. The skilled person will also add individual aspects as improvements or additions to the respective basic form of the invention.

drawings

The invention is described in more detail below with reference to the accompanying drawings and to exemplary embodiments. Show it:

1 is a simplified block diagram of a bus system according to a first embodiment; FIG. 2 is a block diagram of a transmitting / receiving device of the bus system according to the first embodiment; FIG.

3 shows a further simplified block diagram of the transmitting / receiving device of the bus system according to the first embodiment;

4 to 7 are timing charts of a transmission signal TX, a voltage VSUP, and a reception signal RX at the first and second

Subscriber station of the bus system according to the first embodiment;

8 is a timing diagram of a portion of a message of a

Subscriber station of the bus system according to a second embodiment; and FIG. 9 shows a block diagram of a subscriber station of the bus system according to a third exemplary embodiment.

In the figures, identical or functionally identical elements are provided with the same reference numerals, unless stated otherwise.

Description of the embodiments

Fig. 1 shows a bus system 1, which may be, for example, a LI N bus system. The bus system 1 can be used in a vehicle, in particular a motor vehicle, an aircraft, etc., or in the hospital, etc.

In particular, when implemented as a LIN bus system, the bus system 1 can be used for communication between electrical components, such as sensors, actuators, etc., of a vehicle seat or a vehicle door. In Fig. 1, the bus system 1 has a plurality of subscriber stations 10, 20, 30, which are each connected to a bus 40. Via the bus 40, messages 41, 42, 43 may be transmitted in the form of signals between the individual subscriber stations 10, 20, 30. In the case of a LIN bus system as bus system 1, the subscriber station 10 may be a LI N master, whereas the subscriber stations 20, 30 each form LIN slaves which are subordinate to the LI N master in terms of control.

As shown in Fig. 1, the subscriber stations 10 has a

Communication control device 11 and a Empfangvempfangseinrichtung 12th

The subscriber stations 20 each have one

On the other hand, the subscriber station 30 has a communication control device 31, a transmission reception device 32 and a transmission signal delay unit 33. The transmission reception device 12 of FIG

Subscriber station 10, the transceiver 22 of the

Subscriber stations 20 and the transmitting receiving device 32 of

Subscriber station 30 are each connected directly to the bus 40, although this is not shown in Fig. 1.

The communication control device 11 is for controlling a

Communication of the subscriber station 10 via the bus 40 with one or more other of the subscriber stations 20, 30. The transceiver 12 is used to transmit a message 41 in the form of signals and to control a timing of a transmission signal TX (see FIG. for the bus system 1 to meet the duty cycle requirements, as described more fully later with reference to FIGS. 2 to 7. The communication control device 11 may like a

conventional LIN controller for a LIN master.

The communication controller 21 is for controlling a

Communication of a subscriber station 20 via the bus 40 with the

Subscriber station 10. The transceiver device 22 is used for transmitting a message 42 or 44 in the form of signals to or receiving a message 41 in the form of signals from the subscriber station 10. In addition, the transceiver device 22 is used to control the timing of the transmission signal TX (see FIG 4) for the bus system 1 to meet the duty cycle requirements, as previously mentioned and described in more detail below. The communication controller 21 may be implemented like a conventional LIN controller for a LIN slave. The communication control device 31 is for controlling a

Communication of the subscriber station 30 via the bus 40 with the

Subscriber station 10. The transceiver 32 is used to send a message 43 to or receive a message 41 from the

Subscriber station 10. The transceiver 32 may be implemented like a conventional LI N transceiver for a LIN slave. The

Transmit signal delay unit 33 serves to control the timing of transmit signal TX for bus system 1 to meet the duty cycle requirements, as previously mentioned and described in more detail below.

Fig. 2 shows the transmitting / receiving device 12 in more detail. The transmitting / receiving devices 22 are each constructed in the same way as the transmitting / receiving device 12, so that reference is also made to the following description of the transmitting / receiving device 12 for the transmitting / receiving devices 22.

Referring to FIG. 2, the transceiver 12 includes a pull-up unit 121, a wake-up unit 122, an ESD protection unit 123, a drain diode 124 executable as a LIN diode, a LIN driver 125, an LI N receive unit 126, an LI N slope control unit 127, a detection unit 128, a control unit 129 and a TX delay unit or transmission signal delay unit 130. The units 121 to 127 have the same functions as corresponding units 121 to 127 of a conventional LIN transceiver. The transmitting / receiving device 12 is supplied with appropriate control via terminals 51, 52 of the wake-up unit 122 and the LIN receiving unit 126 from a voltage source 50 by means of the terminals 53 to 55 with voltage to signals from the bus 40 to received, or put into a so-called sleep state. At the terminal 52, the output of the LI N receiving unit 126 designed as a receiving comparator, a signal RXLin or received signal RX, RX1, RX2 (see Fig. 6 and Fig

passed. In addition, the transmitting / receiving device 12 has further supply terminals 56 to 58, which like the terminals 51 to 55, equal to the Terminals of a conventional LI N transceiver and are therefore not further explained here.

At a connection 61 (LINBus) the transmitting / receiving device 12 is connected to the bus 40. At a port 62 (LinGND), the transmission

/ Receiving device 12 connected to the ground of the bus 40. At an input 63, a transmission signal TX (see Fig. 4) from the

Communication control device 11 is fed into the transmitting / receiving device 12. Via the input 64, the signal TX _A us (TXOFF) can be fed. The other inputs 65 to 70 are the same as the conventional ones

Inputs and are therefore not explained here.

3 shows the arrangement of the detection unit 128, the control unit 129 and the transmission signal delay unit 130 in a control diagram according to the first embodiment. The transmission signal delay unit 33 of

Subscriber station 30 likewise comprises a detection unit 128, a control unit 129 and a transmission signal delay unit 130. Thereby, the transmission signal delay unit 33 of the subscriber station 30 also has the functions of the detection unit 128 described below

Control unit 129 and the transmission signal delay unit 130 on.

According to FIG. 3, the detection unit 128 is connected to the bus 40. The detection unit 128 is the control unit 129 downstream. The control unit

129 and thus also the detection unit 128, the transmission signal delay unit 130 is connected downstream. The transmission signal delay unit

130, the LI N driver 125 is connected downstream. The LI N driver 125 is the

Latch diode 124 downstream. Due to the method described below, which is performed by the detection unit 128, the control unit 129, and the transmission signal delay unit 130, the requirements shown in FIGS. 4 to 7 are satisfied according to the LI N bus specification.

Here, FIG. 4 shows the profile of the transmission signal TX over the time t, as it is input at the transmitting subscriber station 10 by the communication control device 11 at the input 63 of the transceiver 12. The transmission signal TX is a rectangular signal having a recessive level 85 and a dominant level 86. The transmit signal TX has the same bit width tbit for each bit.

FIG. 5 shows the profile of a signal on the bus 40 over the time t resulting from the transmission signal TX of FIG. 4. The signal has an amplitude VSUP of the supply voltage from the voltage source 50 for the transceiver 12. The signal holds that indicated in FIG

Thresholds 90, 91 for receive thresholds at the second subscriber station 30 and thresholds 92, 93 for receive thresholds at the first

Subscriber station 20. The threshold value 90 corresponds to the minimum value of the dominant level 86 at the second subscriber station 30. The threshold value 91 corresponds to the minimum value of the recessive level 85 at the second subscriber station 30. The threshold value 92 corresponds to the maximum value of the dominant level 86 at the first subscriber station 20 The threshold value 93 corresponds to the maximum value of the recessive level 85 at the first one

Subscriber station 20.

In addition, the signal shown in Fig. 5 satisfies the allowable bit widths. In this case, the bit width tBus_dom (max) of the signal corresponds to the maximum bit width of the dominant level 86 of the signal on the bus 40. The bit width tBus_dom (min) corresponds to the minimum bit width of the dominant level 86 of the signal on the bus 40. The bit width tBus_rec (max ) corresponds to the maximum bit width of the recessive level 85 of the signal on the bus 40. The bit width tBus_rec (min) corresponds to the minimum bit width of the recessive level 85 of the signal on the bus 40.

FIG. 6 shows, over the time t, the received signal RX1, which occurs as a result of the transmission signal TX at the first subscriber station 20. FIG. The

Receive signal RX1 has a bit width tBitll for dominant bits and a bit width tBitl2 for recessive bits. The falling edge of the received signal RX1 is delayed by a delay time trx_pdf (l) from the signal on the bus 40 of FIG. 5, as illustrated by the dashed lines in FIG. 5 and FIG. The rising edge of the received signal RX1 is offset by a delay time trx_pdr (l) from the signal on the bus 40 according to FIG. 5 as indicated by the dashed lines in FIG. 5 and FIG. 6

illustrated.

FIG. 7 shows, over the time t, the received signal RX2, which is established as a result of the transmission signal TX at the second subscriber station 30. The

Receive signal RX2 has a bit width tBit21 for dominant bits and a bit width tBit22 for recessive bits. The falling edge of the received signal RX2 is delayed by a delay time trx_pdf (2) from the signal on the bus 40 of FIG. 5, as illustrated by the dashed lines in FIGS. 5 to 7. The rising edge of the received signal RX2 is one

Delay time trx_pdr (2) is delayed from the signal on the bus 40 of FIG. 5, as illustrated by the dashed lines in FIGS. 5 to 7.

The following influencing factors have an effect on the timing requirements of the subscriber station 10 as the transmitting subscriber station

Duty cycle (duty cycle) from:

the symmetry of the propagation delay time (propagation time symmetry) of the transmitting subscriber station, and

- The edge steepness for rising and falling edge of the bus signal.

In this case, the propagation delay time is equal to the time that elapses between a time of occurrence of an edge on the transmission signal TX until the time at which the edge is detected on the reception signal RX. The symmetry of the propagation delay time of the transmitting subscriber station (Prop delay time symmetry) is then calculated from the subtraction of the propagation delay time of the transition from the dominant to the recessive state of the bus signal (prop delay time thorn to rez) and the propagation delay time of the transition from the recessive to the dominant state the bus signal (prop delay time to tooth). This can also be specified as Prop delay time symmetry = prop delay time thorn to rez-prop delay time to thorn.

The detection unit 128, while the transmission / reception device 12 transmits, detects the bit widths tbit1 and tbit2, respectively, at the terminal 52, which adjusts based on the transmission signal TX of FIG. Thus, during normal operation of the transceiver 12, the detection unit 128 detects the bit width tbit1 or tbit2 the message 41 received from the bus 40. Preferably, the detection unit 128 acquires the bit widths tBitll, tBitl2 or tBit21, tBit22 for both dominant and recessive bits of the received signal RX, RX1, RX2, the control unit 129 based on this Transmission signal TX specifically delayed, as described below.

For this purpose, the control unit 129 first determines the bit width for the transmission signal TX of a message 41 to be retransmitted on the basis of the bit width of a message 41 previously transmitted and then received as received signal RX, RX1, RX2. The detected bit widths are determined by the maximum and minimum

Bit widths tBus_dom (max), tBus_dom (min), tBus_rec (max), tBus_rec (min) for the signal on the bus 40. Thereby, the control unit 129 determines how the edges of the transmission signal TX are to be delayed by the duty requirements (duty cycle). Here, the flanks of the

Transmission signal TX delayed such that the specified in Fig. 5 thresholds

91 to 93 and the maximum and minimum bit widths tBus_dom (max), tBus_dom (min), tBus_rec (max), tBus_rec (min) for the signal on bus 40 are met. The determined value for the edges of the transmission signal TX is from the

Control unit 129 to the transmit signal delay unit 130 which delays the edges of the transmission signal TX with the determined by the control unit 129 and then predetermined delay value. The delay value is fractions of a minimum bit time corresponding to the bit widths tBit, tBitl, tBit2. The delay value can be in several temporal

Be subdivided sizes that are adjustable or adjustable. Additionally or alternatively, the gradations of the delay value may be made proportional to the bit rate, which is the ratio of a data amount at a time, for example, bits per second.

Thus, the detection unit 128, the control unit 129 and the

Transmission signal delay unit 130 is a method for controlling timing of edges of the transmission signal TX for the bus system 1 from. In this case, in a first step, the detection unit 128 detects the bit width tBit1 or tBit2 of received bits of the received signal RX. This corresponds to the Receive signal RX preferably the previously transmitted from the subscriber station 10 on the bus 40 transmit signal TX for the message 41. In one

subsequent step, the control unit 129 determines the bit width tBit of bits of the transmission signal TX for the message 41 to satisfy the bus system requirements on the duty cycle. Thereafter, the control unit 129 controls the

Transmit signal TX of another message to be transmitted 41 by delaying the edges of the transmission signal TX corresponding to the message on the

Basis of the bit width tBitl or tBit2 detected by the acquisition unit.

Referring now to Fig. 8, with respect to a second embodiment of the receive signal RXD1, a field 80 is shown as part of the message 41 received at the output 52. The messages 42, 43, 44 have a same field 80. The illustrated field 80 of the message 41 has one Start bit 81 and a stop bit 82. In between, bits B0 to B8 are arranged.

In field 80, the directly consecutive bits change from one to the other state. Consequently, the bit B0 changes from the illustrated recessive level 85 to the bit B1 into the dominant level 86, the bit B2 again has the recessive level 85, etc. The field 80 may be the sync field in the LIN bus system.

According to the present embodiment, the detection unit 128 performs its detection of the bit width tBit for dominant and recessive bits during the field 80. Since it is ensured in the field 80 that 8 bits are transmitted with a continuous state change, as shown in Fig. 8, the bit width tBit can be detected very reliably.

The control unit 129 may maintain the value for the delay of the edges of the message 41 to be sent until it is received

Message the next synchronization field is pending.

Otherwise, the present embodiment is carried out in the same manner as described above for the first embodiment. 9 shows a subscriber station 10 according to a third exemplary embodiment. Here, the detection unit 128 and the control unit 129 are part of one

Communication control device 110. The communication control device 110 also has a unit 111, which performs the functions of a conventional LI N communication control device, ie a

Communication control device 11 has. By contrast, the transmission signal delay unit 130 is part of a transmission / reception device 120. Otherwise, the subscriber station 10 is in accordance with the third

Embodiment constructed as the subscriber station 10 according to the first and / or second embodiment.

According to a modification of the third embodiment is also the

Transmission signal delay unit 130 is part of the communication control device 110.

According to another modification of the third embodiment, only the detection unit 128 is part of the communication control device 110.

All of the previously described embodiments of the bus system 1 of

Subscriber stations 10, 20, 30 and the method according to the first to third embodiments and their modifications may be used individually or in all possible combinations. In addition are

in particular the following modifications conceivable.

The bus system 1 according to the first and second described above

Embodiment is described by means of a based on the LIN protocol bus system.

As described above, the functionality of the embodiments described above can be in a transceiver or a transceiver 12 or a LIN transceiver or a transceiver chipset or a LIN transceiver chipset or in the

Implement communication control device 1 1, etc. Additionally or alternatively, it can be integrated into existing products. In particular, it is possible that the considered functionality is either separate in the transceiver electronic module (chip) realized or embedded in an integrated overall solution in which only an electronic component (chip) is present.

After that, it is possible that the subscriber stations 10, 20, 30 and the method according to the first to third embodiments and their

Modifications are additionally supplemented by a method for controlling a transmission signal for a bus system with which the emission is reduced and the timing requirements of the bus system can nevertheless be met. In this case, the subscriber stations 10, 20, 30 can execute a method for regulating a transmission signal for a bus system, comprising the steps of: detecting, with a detection unit, a measure of a

Emission / emission by switching operations based on a message sent in the bus system, detecting, with a second detection unit, a slope of a message sent in the bus system, and rules, with a control unit, the edge steepness and / or an edge form of the message sent in the bus system based on a Detection result of the first detection unit and a detection result of the second

Detection unit to minimize disturbances due to switching due to a message sent in the bus system and to meet the requirements of the bus system to a timing of the message. This method is described in detail in another application by the assignee of the present invention.

Claims

claims

1) subscriber station (10) for a bus system (1), with

a detection unit (128) for detecting a bit width (tBitl; tBitll, tBitl2; tBit21, tBit22) of received bits (81, 82, Bl to B7) of a message transmitted via a bus (40) of the bus system (1)

(41), and

a control unit (129) for determining the bit width (tBit) of at least one bit of a message (41) to be sent in order to meet the bus system requirements on the duty cycle and by the bit width (tBit) by delaying the edges of one of the messages (41 ) according to the bit width detected by the detection unit (128) (tbit1; tbit2, tbit2; tbit21, tbit22). 2) subscriber station (10) according to claim 1,

additionally with a transmitting / receiving device (12, 120) for transmitting and / or receiving messages (41, 42, 43, 44),

wherein the detection unit (128) is configured to detect the bit width (tBitll, tBitl2; tBit21, tBit22) while the transceiver (12; 120) transmits messages (41).

3) subscriber station (10) according to claim 1 or 2, wherein the

Detection unit (128) for detecting the bit width (tBitl; tBitll, tBitl2; tBit21, tBit22) of recessive and / or dominant bits of messages (41) sent over the bus (40).

4) subscriber station according to one of the preceding claims,

wherein the bit width detection unit (128) is configured during a synchronization field (80) of the message (41), and wherein the control unit (129) is designed to control the bit width (tBit) for a pending message (41) to be sent.

Subscriber station (10) according to Claim 4,

wherein the bus system (1) is a LIN bus system, and

wherein the control unit (129) sets the value for the delay of

Retains edges of the message (41) to be sent until the next synchronization field (80) is present in a received message (41).

Subscriber station (10) according to one of the preceding claims, wherein the subscriber station (10) is designed to transmit and / or receive messages (41) according to the LIN standard.

Subscriber station (10) according to one of the preceding claims, further comprising a communication control device (11, 110) for creating or reading a message (41) for or from another subscriber station (20, 30) of the bus system (1).

Subscriber station (10) according to claim 7,

wherein the detection unit (128) and / or the control unit (129) are part of the communication control device (11; 110) or part of the transmitting / receiving device (12; 120), and

wherein the control unit (129) is followed by a transmission signal delay unit (130), which is part of

Communication control device (11; 110) or part of the transmitting / receiving device (12; 120).

LIN bus system (1), with

a bus (40), and

a first subscriber station (10) as a master and at least one second subscriber station (20, 30) as a slave, which are connected to one another via the bus (40) such that they can communicate with one another, wherein the first subscriber station (10) and the at least one second subscriber station (20, 30) are a subscriber station according to one of the preceding claims.

Method for controlling a timing of a transmission signal (TX) for a bus system (1), comprising the steps

Detecting, with a detection unit (128), a bit width (tbit1; tbit1, tbit2; tbit21, tbit2) of received bits of a message (41) sent via a bus (40) of the bus system (1),

Determining, with a control unit (129), the bit width (tBit) of at least one bit of a message (41) to be sent to satisfy the bus system duty cycle requirements, and

Rules, with the control unit (129), the bit width (tBit) of one of the signal to be transmitted (41) corresponding signal

Delaying the edges of the transmission signal (TX) corresponding to the message (41) on the basis of the bit width detected by the detection unit (tbit1; tbit2, tbit2; tbit21, tbit22).